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How to Build a Simple Semantic Cache for Similar Prompts in Python

Mock a semantic cache that finds the closest matching prompt using word-overlap similarity and returns cached results above a threshold.

semantic cache prompt matching llm

Python

prompt_cache = [
    "What is the capital of France?",
    "How does recursion work?",
    "Best practices for Python logging?",
    "Explain binary search in one line.",
    "How to reverse a string in Python?"
]

def normalize(text):
    return " ".join(text.lower().split())

def similarity(a, b):
    a_words = set(…

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Guide: free Python code samples library

Copy-ready Python snippets for learners and developers

PythonSkillset code samples are short, focused examples organised by topic and difficulty. Every snippet is server-rendered HTML — readable by search engines and easy to copy. Open any sample, read the notes, copy the code, then press Try in editor to run it in the browser with Pyodide.

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Pick a topic section — strings, lists, files, functions, and more
Open a sample, read How it works, and copy the code block
Run it in the IDE, tweak values, then take a related quiz or tutorial lesson

Samples vs tutorials and challenges

Samples are quick reference — one concept per page. For step-by-step teaching, use our Python tutorials. To test yourself, try quizzes or coding challenges. Clean up style with the Python formatter.

Free online Python IDE Write and run Python in your browser — no install. Free Python code formatter Format with autopep8 — side-by-side PEP 8 cleanup.